Can particle creation phenomena replace dark energy?

TL;DR

This paper proposes a particle creation model that can explain cosmic evolution without dark energy, fitting observational data across different redshifts and requiring a specific matter composition.

Contribution

It introduces a new particle creation model that aligns with both low and high redshift observations, improving upon previous models that failed to meet WMAP constraints.

Findings

Model fits SNIa data at low redshift

Model satisfies WMAP constraints on matter-radiation equality

Requires 26% primeval matter (baryons and CDM)

Abstract

Particle creation at the expense of gravitational field might be sufficient to explain the cosmic evolution history, without the need of dark energy at all. This phenomena has been investigated in a recent work by Lima et-al, assuming particle creation at the cost of gravitational energy in the late Universe. However, the model does not satisfy the WMAP constraint on matter-radiation equality. Here, we have suggested a model, in the same framework, which fits perfectly with SNIa data at low redshift as well as early Integrated Sachs-Wolfe effect on matter-radiation equality determined by WMAP at high redshift. Such a model, requires the presence of nearly 26% primeval matter in the form of baryons and CDM.